Uridine, a nucleoside, contains an uracil attached to a ribose ring (known as a ribofuranose) via a β-N1-glycosidic bond.
If uracil is attached to a deoxyribose ring, it is known as a deoxyuridine.
Read more about Uridine: Dietary Sources of Uridine, Uridine in The Glycolysis Pathway